C++ ExecState::clearException方法代码示例

bool JSValueIsEqual(JSContextRef ctx, JSValueRef a, JSValueRef b, JSValueRef* exception)
{
    if (!ctx) {
        ASSERT_NOT_REACHED();
        return false;
    }
    ExecState* exec = toJS(ctx);
    JSLockHolder locker(exec);

    JSValue jsA = toJS(exec, a);
    JSValue jsB = toJS(exec, b);

    bool result = JSValue::equal(exec, jsA, jsB); // false if an exception is thrown
    if (exec->hadException()) {
        JSValue exceptionValue = exec->exception();
        if (exception)
            *exception = toRef(exec, exceptionValue);
        exec->clearException();
#if ENABLE(REMOTE_INSPECTOR)
        exec->vmEntryGlobalObject()->inspectorController().reportAPIException(exec, exceptionValue);
#endif
    }
    return result;
}

EXPORT
JSValueRef JSObjectCallAsFunction(JSContextRef ctx, JSObjectRef object, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef* exception)
{
    JSLock lock;
    ExecState* exec = toJS(ctx);
    JSObject* jsObject = toJS(object);
    JSObject* jsThisObject = toJS(thisObject);

    if (!jsThisObject)
        jsThisObject = exec->dynamicInterpreter()->globalObject();
    
    List argList;
    for (size_t i = 0; i < argumentCount; i++)
        argList.append(toJS(arguments[i]));

    JSValueRef result = toRef(jsObject->call(exec, jsThisObject, argList)); // returns NULL if object->implementsCall() is false
    if (exec->hadException()) {
        if (exception)
            *exception = toRef(exec->exception());
        exec->clearException();
        result = 0;
    }
    return result;
}

JSObjectRef JSObjectMakeFunction(JSContextRef ctx, JSStringRef name, unsigned parameterCount, const JSStringRef parameterNames[], JSStringRef body, JSStringRef sourceURL, int startingLineNumber, JSValueRef* exception)
{
    JSLock lock;
    
    ExecState* exec = toJS(ctx);
    UString::Rep* bodyRep = toJS(body);
    UString::Rep* sourceURLRep = sourceURL ? toJS(sourceURL) : &UString::Rep::null;
    
    Identifier nameID = name ? Identifier(toJS(name)) : Identifier("anonymous");
    
    List args;
    for (unsigned i = 0; i < parameterCount; i++)
        args.append(jsString(UString(toJS(parameterNames[i]))));
    args.append(jsString(UString(bodyRep)));

    JSObject* result = exec->dynamicInterpreter()->builtinFunction()->construct(exec, args, nameID, UString(sourceURLRep), startingLineNumber);
    if (exec->hadException()) {
        if (exception)
            *exception = toRef(exec->exception());
        exec->clearException();
        result = 0;
    }
    return toRef(result);
}

JSValue JSSubtleCrypto::unwrapKey(ExecState* exec)
{
    if (exec->argumentCount() < 5)
        return exec->vm().throwException(exec, createNotEnoughArgumentsError(exec));

    CryptoKeyFormat keyFormat;
    if (!cryptoKeyFormatFromJSValue(exec, exec->argument(0), keyFormat)) {
        ASSERT(exec->hadException());
        return jsUndefined();
    }

    CryptoOperationData wrappedKeyData;
    if (!cryptoOperationDataFromJSValue(exec, exec->uncheckedArgument(1), wrappedKeyData)) {
        ASSERT(exec->hadException());
        return jsUndefined();
    }

    RefPtr<CryptoKey> unwrappingKey = JSCryptoKey::toWrapped(exec->uncheckedArgument(2));
    if (!unwrappingKey)
        return throwTypeError(exec);

    if (!unwrappingKey->allows(CryptoKeyUsageUnwrapKey)) {
        m_impl->document()->addConsoleMessage(MessageSource::JS, MessageLevel::Error, ASCIILiteral("Key usages do not include 'unwrapKey'"));
        setDOMException(exec, NOT_SUPPORTED_ERR);
        return jsUndefined();
    }

    std::unique_ptr<CryptoAlgorithm> unwrapAlgorithm;
    std::unique_ptr<CryptoAlgorithmParameters> unwrapAlgorithmParameters;
    unwrapAlgorithm = createAlgorithmFromJSValue(exec, exec->uncheckedArgument(3));
    if (!unwrapAlgorithm) {
        ASSERT(exec->hadException());
        return jsUndefined();
    }
    unwrapAlgorithmParameters = JSCryptoAlgorithmDictionary::createParametersForDecrypt(exec, unwrapAlgorithm->identifier(), exec->uncheckedArgument(3));
    if (!unwrapAlgorithmParameters) {
        ASSERT(exec->hadException());
        return jsUndefined();
    }

    std::unique_ptr<CryptoAlgorithm> unwrappedKeyAlgorithm;
    std::unique_ptr<CryptoAlgorithmParameters> unwrappedKeyAlgorithmParameters;
    if (!exec->uncheckedArgument(4).isNull()) {
        unwrappedKeyAlgorithm = createAlgorithmFromJSValue(exec, exec->uncheckedArgument(4));
        if (!unwrappedKeyAlgorithm) {
            ASSERT(exec->hadException());
            return jsUndefined();
        }
        unwrappedKeyAlgorithmParameters = JSCryptoAlgorithmDictionary::createParametersForImportKey(exec, unwrappedKeyAlgorithm->identifier(), exec->uncheckedArgument(4));
        if (!unwrappedKeyAlgorithmParameters) {
            ASSERT(exec->hadException());
            return jsUndefined();
        }
    }

    bool extractable = false;
    if (exec->argumentCount() >= 6) {
        extractable = exec->uncheckedArgument(5).toBoolean(exec);
        if (exec->hadException())
            return jsUndefined();
    }

    CryptoKeyUsage keyUsages = 0;
    if (exec->argumentCount() >= 7) {
        if (!cryptoKeyUsagesFromJSValue(exec, exec->argument(6), keyUsages)) {
            ASSERT(exec->hadException());
            return jsUndefined();
        }
    }

    JSPromiseDeferred* promiseDeferred = JSPromiseDeferred::create(exec, globalObject());
    DeferredWrapper wrapper(exec, globalObject(), promiseDeferred);
    Strong<JSDOMGlobalObject> domGlobalObject(exec->vm(), globalObject());

    CryptoAlgorithm* unwrappedKeyAlgorithmPtr = unwrappedKeyAlgorithm.release();
    CryptoAlgorithmParameters* unwrappedKeyAlgorithmParametersPtr = unwrappedKeyAlgorithmParameters.release();

    auto decryptSuccessCallback = [domGlobalObject, keyFormat, unwrappedKeyAlgorithmPtr, unwrappedKeyAlgorithmParametersPtr, extractable, keyUsages, wrapper](const Vector<uint8_t>& result) mutable {
        auto importSuccessCallback = [wrapper](CryptoKey& key) mutable {
            wrapper.resolve(&key);
        };
        auto importFailureCallback = [wrapper]() mutable {
            wrapper.reject(nullptr);
        };
        ExecState* exec = domGlobalObject->globalExec();
        WebCore::importKey(exec, keyFormat, std::make_pair(result.data(), result.size()), std::unique_ptr<CryptoAlgorithm>(unwrappedKeyAlgorithmPtr), std::unique_ptr<CryptoAlgorithmParameters>(unwrappedKeyAlgorithmParametersPtr), extractable, keyUsages, WTF::move(importSuccessCallback), WTF::move(importFailureCallback));
        if (exec->hadException()) {
            // FIXME: Report exception details to console, and possibly to calling script once there is a standardized way to pass errors to WebCrypto promise reject functions.
            exec->clearException();
            importFailureCallback();
        }
    };

    auto decryptFailureCallback = [wrapper, unwrappedKeyAlgorithmPtr, unwrappedKeyAlgorithmParametersPtr]() mutable {
        delete unwrappedKeyAlgorithmPtr;
        delete unwrappedKeyAlgorithmParametersPtr;
        wrapper.reject(nullptr);
    };

    ExceptionCode ec = 0;
//.........这里部分代码省略.........

void JSLazyEventListener::parseCode(ScriptExecutionContext* executionContext) const
{
    ASSERT(executionContext);
    ASSERT(executionContext->isDocument());
    if (!executionContext)
        return;

    if (m_parsed)
        return;

    Frame* frame = static_cast<Document*>(executionContext)->frame();
    if (!frame)
        return;

    ScriptController* scriptController = frame->script();
    if (!scriptController->isEnabled())
        return;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext);
    if (!globalObject)
        return;

    // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.
    if (m_originalNode) {
        JSLock lock(SilenceAssertionsOnly);
        // FIXME: Should pass the global object associated with the node
        toJS(globalObject->globalExec(), globalObject, m_originalNode);
    }

    if (executionContext->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return;
        // FIXME: Is this check needed for non-Document contexts?
        ScriptController* script = frame->script();
        if (!script->isEnabled() || script->isPaused())
            return;
    }

    m_parsed = true;

    ExecState* exec = globalObject->globalExec();

    MarkedArgumentBuffer args;
    args.append(jsNontrivialString(exec, m_eventParameterName));
    args.append(jsString(exec, m_code));

    m_jsFunction = constructFunction(exec, args, Identifier(exec, m_functionName), m_sourceURL, m_lineNumber); // FIXME: is globalExec ok?

    JSFunction* listenerAsFunction = static_cast<JSFunction*>(m_jsFunction);

    if (exec->hadException()) {
        exec->clearException();

        // failed to parse, so let's just make this listener a no-op
        m_jsFunction = 0;
    } else if (m_originalNode) {
        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        ScopeChain scope = listenerAsFunction->scope();

        JSValue thisObj = toJS(exec, globalObject, m_originalNode);
        if (thisObj.isObject()) {
            static_cast<JSNode*>(asObject(thisObj))->pushEventHandlerScope(exec, scope);
            listenerAsFunction->setScope(scope);
        }
    }

    // Since we only parse once, there's no need to keep data used for parsing around anymore.
    m_functionName = String();
    m_code = String();
    m_eventParameterName = String();
    m_sourceURL = String();
}

JSObject* JSLazyEventListener::initializeJSFunction(ScriptExecutionContext* executionContext) const
{
    ASSERT(is<Document>(executionContext));
    if (!executionContext)
        return nullptr;

    ASSERT(!m_code.isNull());
    ASSERT(!m_eventParameterName.isNull());
    if (m_code.isNull() || m_eventParameterName.isNull())
        return nullptr;

    Document& document = downcast<Document>(*executionContext);

    if (!document.frame())
        return nullptr;

    if (!document.contentSecurityPolicy()->allowInlineEventHandlers(m_sourceURL, m_sourcePosition.m_line))
        return nullptr;

    ScriptController& script = document.frame()->script();
    if (!script.canExecuteScripts(AboutToExecuteScript) || script.isPaused())
        return nullptr;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext, isolatedWorld());
    if (!globalObject)
        return nullptr;

    ExecState* exec = globalObject->globalExec();

    MarkedArgumentBuffer args;
    args.append(jsNontrivialString(exec, m_eventParameterName));
    args.append(jsStringWithCache(exec, m_code));

    // We want all errors to refer back to the line on which our attribute was
    // declared, regardless of any newlines in our JavaScript source text.
    int overrideLineNumber = m_sourcePosition.m_line.oneBasedInt();

    JSObject* jsFunction = constructFunctionSkippingEvalEnabledCheck(
        exec, exec->lexicalGlobalObject(), args, Identifier::fromString(exec, m_functionName),
        m_sourceURL, m_sourcePosition, overrideLineNumber);

    if (exec->hadException()) {
        reportCurrentException(exec);
        exec->clearException();
        return nullptr;
    }

    JSFunction* listenerAsFunction = jsCast<JSFunction*>(jsFunction);

    if (m_originalNode) {
        if (!wrapper()) {
            // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.
            JSLockHolder lock(exec);
            // FIXME: Should pass the global object associated with the node
            setWrapper(exec->vm(), asObject(toJS(exec, globalObject, *m_originalNode)));
        }

        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        listenerAsFunction->setScope(exec->vm(), jsCast<JSNode*>(wrapper())->pushEventHandlerScope(exec, listenerAsFunction->scope()));
    }
    return jsFunction;
}

JSObject* JSLazyEventListener::initializeJSFunction(ScriptExecutionContext* executionContext) const
{
    ASSERT(executionContext);
    ASSERT(executionContext->isDocument());
    if (!executionContext)
        return 0;

    Frame* frame = static_cast<Document*>(executionContext)->frame();
    if (!frame)
        return 0;

    ScriptController* scriptController = frame->script();
    if (!scriptController->canExecuteScripts(AboutToExecuteScript))
        return 0;

    JSDOMGlobalObject* globalObject = toJSDOMGlobalObject(executionContext, isolatedWorld());
    if (!globalObject)
        return 0;

    if (executionContext->isDocument()) {
        JSDOMWindow* window = static_cast<JSDOMWindow*>(globalObject);
        Frame* frame = window->impl()->frame();
        if (!frame)
            return 0;
        // FIXME: Is this check needed for non-Document contexts?
        ScriptController* script = frame->script();
        if (!script->canExecuteScripts(AboutToExecuteScript) || script->isPaused())
            return 0;
    }

    ExecState* exec = globalObject->globalExec();

    MarkedArgumentBuffer args;
    args.append(jsNontrivialString(exec, stringToUString(m_eventParameterName)));
    args.append(jsString(exec, m_code));

    JSObject* jsFunction = constructFunction(exec, args, Identifier(exec, stringToUString(m_functionName)), stringToUString(m_sourceURL), m_lineNumber); // FIXME: is globalExec ok?
    if (exec->hadException()) {
        exec->clearException();
        return 0;
    }

    JSFunction* listenerAsFunction = static_cast<JSFunction*>(jsFunction);
    if (m_originalNode) {
        if (!wrapper()) {
            // Ensure that 'node' has a JavaScript wrapper to mark the event listener we're creating.
            JSLock lock(SilenceAssertionsOnly);
            // FIXME: Should pass the global object associated with the node
            setWrapper(asObject(toJS(globalObject->globalExec(), globalObject, m_originalNode)));
        }

        // Add the event's home element to the scope
        // (and the document, and the form - see JSHTMLElement::eventHandlerScope)
        ScopeChain scope = listenerAsFunction->scope();
        static_cast<JSNode*>(wrapper())->pushEventHandlerScope(exec, scope);
        listenerAsFunction->setScope(scope);
    }

    // Since we only parse once, there's no need to keep data used for parsing around anymore.
    m_functionName = String();
    m_code = String();
    m_eventParameterName = String();
    m_sourceURL = String();
    return jsFunction;
}

RefPtr<IDBRequest> IDBObjectStore::putOrAdd(ExecState& state, JSValue value, RefPtr<IDBKey> key, IndexedDB::ObjectStoreOverwriteMode overwriteMode, InlineKeyCheck inlineKeyCheck, ExceptionCodeWithMessage& ec)
{
    LOG(IndexedDB, "IDBObjectStore::putOrAdd");
    ASSERT(currentThread() == m_transaction->database().originThreadID());

    auto context = scriptExecutionContextFromExecState(&state);
    if (!context) {
        ec.code = IDBDatabaseException::UnknownError;
        ec.message = ASCIILiteral("Unable to store record in object store because it does not have a valid script execution context");
        return nullptr;
    }

    // The IDB spec for several IDBObjectStore methods states that transaction related exceptions should fire before
    // the exception for an object store being deleted.
    // However, a handful of W3C IDB tests expect the deleted exception even though the transaction inactive exception also applies.
    // Additionally, Chrome and Edge agree with the test, as does Legacy IDB in WebKit.
    // Until this is sorted out, we'll agree with the test and the majority share browsers.
    if (m_deleted) {
        ec.code = IDBDatabaseException::InvalidStateError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The object store has been deleted.");
        return nullptr;
    }

    if (!m_transaction->isActive()) {
        ec.code = IDBDatabaseException::TransactionInactiveError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The transaction is inactive or finished.");
        return nullptr;
    }

    if (m_transaction->isReadOnly()) {
        ec.code = IDBDatabaseException::ReadOnlyError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The transaction is read-only.");
        return nullptr;
    }

    RefPtr<SerializedScriptValue> serializedValue = SerializedScriptValue::create(&state, value, nullptr, nullptr);
    if (state.hadException()) {
        // Clear the DOM exception from the serializer so we can give a more targeted exception.
        state.clearException();

        ec.code = IDBDatabaseException::DataCloneError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: An object could not be cloned.");
        return nullptr;
    }

    bool privateBrowsingEnabled = false;
    if (context->isDocument()) {
        if (auto* page = static_cast<Document*>(context)->page())
            privateBrowsingEnabled = page->sessionID().isEphemeral();
    }

    if (serializedValue->hasBlobURLs() && privateBrowsingEnabled) {
        // https://bugs.webkit.org/show_bug.cgi?id=156347 - Support Blobs in private browsing.
        ec.code = IDBDatabaseException::DataCloneError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: BlobURLs are not yet supported.");
        return nullptr;
    }

    if (key && !key->isValid()) {
        ec.code = IDBDatabaseException::DataError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The parameter is not a valid key.");
        return nullptr;
    }

    bool usesInlineKeys = !m_info.keyPath().isNull();
    bool usesKeyGenerator = autoIncrement();
    if (usesInlineKeys && inlineKeyCheck == InlineKeyCheck::Perform) {
        if (key) {
            ec.code = IDBDatabaseException::DataError;
            ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The object store uses in-line keys and the key parameter was provided.");
            return nullptr;
        }

        RefPtr<IDBKey> keyPathKey = maybeCreateIDBKeyFromScriptValueAndKeyPath(state, value, m_info.keyPath());
        if (keyPathKey && !keyPathKey->isValid()) {
            ec.code = IDBDatabaseException::DataError;
            ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: Evaluating the object store's key path yielded a value that is not a valid key.");
            return nullptr;
        }

        if (!keyPathKey) {
            if (usesKeyGenerator) {
                if (!canInjectIDBKeyIntoScriptValue(state, value, m_info.keyPath())) {
                    ec.code = IDBDatabaseException::DataError;
                    return nullptr;
                }
            } else {
                ec.code = IDBDatabaseException::DataError;
                ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: Evaluating the object store's key path did not yield a value.");
                return nullptr;
            }
        }

        if (keyPathKey) {
            ASSERT(!key);
            key = keyPathKey;
        }
    } else if (!usesKeyGenerator && !key) {
        ec.code = IDBDatabaseException::DataError;
        ec.message = ASCIILiteral("Failed to store record in an IDBObjectStore: The object store uses out-of-line keys and has no key generator and the key parameter was not provided.");
//.........这里部分代码省略.........

void JSAbstractEventListener::handleEvent(Event* ele, bool isWindowEvent)
{
#ifdef KJS_DEBUGGER
    if (KJSDebugWin::instance() && KJSDebugWin::instance()->inSession())
        return;
#endif

    Event *event = ele;

    JSObject* listener = listenerObj();
    if (!listener)
        return;

    Window* window = windowObj();
    Frame *frame = window->frame();
    if (!frame)
        return;
    KJSProxy* proxy = frame->jScript();
    if (!proxy)
        return;

    JSLock lock;
  
    ScriptInterpreter* interpreter = proxy->interpreter();
    ExecState* exec = interpreter->globalExec();
  
    JSValue* handleEventFuncValue = listener->get(exec, "handleEvent");
    JSObject* handleEventFunc = 0;
    if (handleEventFuncValue->isObject()) {      
        handleEventFunc = static_cast<JSObject*>(handleEventFuncValue);
        if (!handleEventFunc->implementsCall())
            handleEventFunc = 0;
    }
  
    if (handleEventFunc || listener->implementsCall()) {
        ref();
      
        List args;
        args.append(toJS(exec, event));
      
        // Set the event we're handling in the Window object
        window->setCurrentEvent(event);
        // ... and in the interpreter
        interpreter->setCurrentEvent(event);
      
        JSValue* retval;
        if (handleEventFunc) {
            interpreter->startTimeoutCheck();
            retval = handleEventFunc->call(exec, listener, args);
        } else {
            JSObject* thisObj;
            if (isWindowEvent)
                thisObj = window;
            else
                thisObj = static_cast<JSObject*>(toJS(exec, event->currentTarget()));
            interpreter->startTimeoutCheck();
            retval = listener->call(exec, thisObj, args);
        }
        interpreter->stopTimeoutCheck();

        window->setCurrentEvent(0);
        interpreter->setCurrentEvent(0);

        if (exec->hadException()) {
            JSObject* exception = exec->exception()->toObject(exec);
            String message = exception->get(exec, messagePropertyName)->toString(exec);
            int lineNumber = exception->get(exec, "line")->toInt32(exec);
            String sourceURL = exception->get(exec, "sourceURL")->toString(exec);
            if (Interpreter::shouldPrintExceptions())
                printf("(event handler):%s\n", message.deprecatedString().utf8().data());
            frame->addMessageToConsole(message, lineNumber, sourceURL);
            exec->clearException();
        } else {
            if (!retval->isUndefinedOrNull() && event->storesResultAsString())
                event->storeResult(retval->toString(exec));
            if (html) {
                bool retvalbool;
                if (retval->getBoolean(retvalbool) && !retvalbool)
                    event->preventDefault();
            }
        }

        Document::updateDocumentsRendering();
        deref();
    }
}

void JSLazyEventListener::parseCode() const
{
  if (!parsed) {
    KHTMLPart *part = qobject_cast<KHTMLPart*>(static_cast<Window*>(win.get())->part());
    KJSProxy *proxy = 0L;
    if (part)
      proxy = part->jScript();

    if (proxy) {
      KJS::ScriptInterpreter *interpreter = static_cast<KJS::ScriptInterpreter *>(proxy->interpreter());
      ExecState *exec = interpreter->globalExec();

      //KJS::Constructor constr(KJS::Global::current().get("Function").imp());
      KJS::FunctionObjectImp *constr = static_cast<KJS::FunctionObjectImp*>(interpreter->builtinFunction());
      KJS::List args;

      if (svg)
          args.append(jsString("evt"));
      else
          args.append(jsString("event"));
      
      args.append(jsString(code));
      listener = constr->construct(exec, args, 
            Identifier(UString(name)), url, lineNum); // ### is globalExec ok ?
      compareListenerImp = listener;

      if (exec->hadException()) {
        exec->clearException();

        // failed to parse, so let's just make this listener a no-op
        listener = 0;
      } else if (!listener->inherits(&DeclaredFunctionImp::info)) {
        listener = 0;// Error creating function
      } else {
        DeclaredFunctionImp *declFunc = static_cast<DeclaredFunctionImp*>(listener.get());

        if (originalNode)
        {
          // Add the event's home element to the scope
          // (and the document, and the form - see KJS::HTMLElement::eventHandlerScope)
          ScopeChain scope = declFunc->scope();

          JSObject *thisObj = getDOMNode(exec, originalNode)->getObject();

          if (thisObj) {
            static_cast<DOMNode*>(thisObj)->pushEventHandlerScope(exec, scope);
            declFunc->setScope(scope);
          }
        }
      }
    }

    // no more need to keep the unparsed code around
    code.clear();

    if (listener) {
      static_cast<Window*>(win.get())->jsEventListeners.insert(QPair<void*, bool>(compareListenerImp.get(), true),
                                              (KJS::JSEventListener *)(this));
    }

    parsed = true;
  }
}